A yellow smiley face is drawn as an SVG circle with eyes, eyebrows, and a mouth, all positioned using D3.js selections and attribute helpers. The eyebrows and mouth animate via chained `transition.attr` calls, moving vertically and scaling over two-second intervals, demonstrating fundamental DOM manipulation with `d3.select`, `d3.arc`, and transition methods. The example uses D3 v5 and renders entirely in SVG.